.main {
	max-width:600px;
	margin:0 auto;
}
.main textarea {
    width:100%;
    background:#eaeaea;
    border:0;
    outline: 0;
    resize:none;/* 使textarea无法调整大小 */
    box-sizing:border-box;
    padding:15px;
}
.main .btn-submit{
    background:#f34545;
    width:90%;
    margin:15px auto;
    text-align:center;
    line-height:44px;
    color:#fff;
    display:block;
    font-size:18px;
}